They are used in accoutancy, temperature and alot of other places
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Negative numbers are simply a continuation of the number line past zero. They indicate a deficit. Without negative numbers, you would not be able to do simple things, such as subtract 5 from 3.
The tally marks I'm familiar with cannot have negative numbers because they are used to count real things and there cannot be a negative apple
Negative numbers are often found in measurements. They are used to represent numbers that have sunk below 0 (ex: temperature, debt) or have become the inverse of a number (velocity, energy, negative exponents). Without machines of sorts negative numbers are very rare in everyday life, but so are very large numbers or very small numbers.
The product of three negative numbers is negative.
They will be negative numbers as for example -5+(-7) = -12